US5309951A - Contact drop wire for an electric warp stop - Google Patents

Contact drop wire for an electric warp stop Download PDF

Info

Publication number
US5309951A
US5309951A US07/897,923 US89792392A US5309951A US 5309951 A US5309951 A US 5309951A US 89792392 A US89792392 A US 89792392A US 5309951 A US5309951 A US 5309951A
Authority
US
United States
Prior art keywords
drop wire
contact
section
head
angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/897,923
Other languages
English (en)
Inventor
Ernst Steiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grob and Co AG
Original Assignee
Grob and Co AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grob and Co AG filed Critical Grob and Co AG
Assigned to GROB & CO. AKTIENGESELLSCHAFT, A CORP. OF SWITZERLAND reassignment GROB & CO. AKTIENGESELLSCHAFT, A CORP. OF SWITZERLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: STEINER, ERNST
Application granted granted Critical
Publication of US5309951A publication Critical patent/US5309951A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/20—Warp stop motions
    • D03D51/28—Warp stop motions electrical
    • D03D51/30—Warp stop motions electrical wherein droppers are suspended on individual warp threads or small groups of threads

Definitions

  • the present invention relates to a contact drop wire for an electric warp stop having a chamfered drop wire head.
  • the contact drop wire for the known electric warp stop is held in a specific position by the warp thread during the weaving operation. If the warp thread tears, the drop wire falls on the contact rail and, due to its shape, closes the electric circuit between the inner and outer part of the contact rail. The current flowing through it serves to turn off the weaving machine. Imperfect fabrics are avoided with these measures.
  • the drop wire could be designed to slide faster on the incline by the provision of a steeper angle so as to also increase the contact pressure with respect to the contact rail.
  • this solution is not commercially feasible.
  • Most of the larger weaving mills pull in the warp threads automatically and, in particular, also by means of the drop wires.
  • These machines are arranged now in such a manner that the drawing-in means are adapted precisely to the drop wire incline of 37° or 30°.
  • a modification in the angle would change the position of the drop wire. This, however, is not Permissible. Either the drop wire or the automatic drawing-in machine would be damaged.
  • an object of the invention is to provide a contact drop wire with a chamfered drop wire head by means of which the aforementioned drawbacks and problems can be solved.
  • a contact drop wire for an electic warp stop with a chamfered drop wire head has an inner edge that faces the contact rail slot of the drop wire, with at least two sections or segments which are differently chamfered.
  • At least one of the segments of this inner edge is designed in such a manner that its angle with respect to the longitudinal direction of axis of the drop wire corresponds now as before to the standard slope of 30° or 37°.
  • the other segment of this inner edge has an incline that is ⁇ 30°, or the angle enclosed between this segment and the longitudinal direction or axis of the drop wire is ⁇ 30°.
  • a preferred enclosed angle is in the range of from 20° to 28°.
  • FIG. 1 is a plan view of a currently usable and commercially available contact drop wire with a chamfered drop wire head
  • FIGS. 2 to 4 are plan views of three prior art pairs of contact drop wires showing the effect of highly chamfered drop wire heads on the automatic drawing in of warp threads;
  • FIG. 5 is a plan view of a contact drop wire designed according to the invention with a chamfered drop wire head and having two differently chamfered sections or segments of the inner edge of the head;
  • FIG. 6 is a plan view, at a slightly enlarged scale, of the inner edge of the drop wire head of FIG. 5 that faces the drop wire slot.
  • FIG. 1 is longitudinal plan view of a contact drop wire for an electric warp stop
  • the contact drop wire 1 comprises a chamfered drop wire head 3, with an inner edge 5 facing the contact rail slot 7.
  • the contact rail slot 7 has extending therethrough, as shown schematically, a contact rail 8 of the warp stop, the upper inner segment of which is rounded off or substantially pointed as at 9.
  • the angle ⁇ enclosed between the longitudinal direction of drop wire 1 and inner edge 5 is normally 30° or 37°, such that the aforedescribed problems can occur if the drop wire head 3 falls on the contact rail point 9 when a warp thread tears.
  • FIGS. 2 and 3 and 4 are schematic drawings of three pairs of contact drop wires 1, where the FIGS. 2 and 4 pairs have a standardized angle ⁇ on the inner edge of the drop wire head 3, whereas the FIG. 3 pair has one inner edge 5' at each drop wire head 3, which with the longitudinal direction of the drop wire 1 encloses at an angle ⁇ , which is significantly less than angle ⁇ .
  • FIGS. 2, 3 and 4 likewise show a part of a drawing-in device 6 or 6', by means of which warp threads can be automatically drawn in.
  • the FIG. 3 pair of contact drop wires shows that the position of drawing-in device 6' with respect to the drawing-in device 6 (FIG. 2) is shifted into the two outer drop wire pairs 1. This is illustrated by the varying distance 4' from the drop wire head 3 of the FIG. 3 drawing-in device 6' relative to the corresponding distance 4 in the FIGS. 2 and 4 drop wire pairs.
  • contact drop wire Pair 1 would be damaged.
  • the drawing-in device 6 or 6' can also be damaged.
  • the contact drop wire 1, shown in FIG. 5, has been devised according to the invention to avoid the aforementioned drawbacks.
  • the drop wire head 3 of the contact drop wire has an inner edge, facing the contact rail slot 7 with two differently chamfered sections 5a and 5b.
  • FIG. 6 is an enlarged view of this inner edge, where it is clear that section 5a with respect to the longitudinal axis of the drop wire 1 has an enclosed angle , whereas the angle enclosed between section 5b and the longitudinal axis of the drop wire 1 is ⁇ .
  • the angle ⁇ can have, for example, the standardized angle of 30° or 37°, whereas the angle ⁇ is ⁇ 30°.
  • the angle ⁇ can range, for example, from 20° to 28°.
  • the ratio between the segments 5a and 5b, or the distance d shown in FIG. 6, depends, for example, on the design of the drawing-in device 6 in order to draw in the warp threads.
  • the incline is divided into two regions 5a and 5b, as shown in FIGS. 5 and 6.
  • the bottom section 5a remains at the currently world-wide standardized incline of 30° or 37°, whereby a length d of 2 mm maximum is adequate.
  • the remaining section of the incline 5, i.e., section 5b, is designed with a steeper angle of 20° to 28° to the longitudinal axis of the drop wire.
  • This two part incline 5a and 5b assures not only the usability on manufactured drawing-in machines, but even the mixability of conventional drop wire types with the new improved types.
  • the weaving mill has the option of using the drop head shape of the invention specifically where its advantages are especially needed, without having to immediately replace all of the existing drop wires. Even in the case of confusion between the two types there need be no fear of damage to the drawing-in machine.
  • the design of the incline 5 according to FIGS. 5 and 6 can, of course, be modified or varied in keeping with the invention.
  • this incline into three segments, so that, for example, in the vicinity of the end of the head, following a steeper incline, a segment is provided that is again less steep.
  • Essential to the invention is that the inclined edge 5 have at least two sections, where the one section corresponds to the standarized incline and at least one section is designed significantly steeper than such standarized incline.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Wire Processing (AREA)
  • Elimination Of Static Electricity (AREA)
  • Looms (AREA)
  • Contacts (AREA)
US07/897,923 1991-06-13 1992-06-15 Contact drop wire for an electric warp stop Expired - Fee Related US5309951A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4119550A DE4119550A1 (de) 1991-06-13 1991-06-13 Kontaktlamelle fuer einen elektrischen kettfadenwaechter
DE4119550 1991-06-13

Publications (1)

Publication Number Publication Date
US5309951A true US5309951A (en) 1994-05-10

Family

ID=6433887

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/897,923 Expired - Fee Related US5309951A (en) 1991-06-13 1992-06-15 Contact drop wire for an electric warp stop

Country Status (5)

Country Link
US (1) US5309951A (de)
BE (1) BE1005019A5 (de)
DE (1) DE4119550A1 (de)
FR (1) FR2677671B1 (de)
IT (1) IT1260542B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040154681A1 (en) * 2002-12-24 2004-08-12 Staubli Faverges Heddle, heddle frame and weaving loom equipped with such a frame
CN102704158A (zh) * 2012-07-06 2012-10-03 常熟市天豪机械有限公司 一种纬纱断头电气自停装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1419077A (en) * 1921-05-11 1922-06-06 Draper Corp Warp stop motion
US2834381A (en) * 1955-04-08 1958-05-13 Grangier Emile Louis Droppers for warp detectors
FR1361816A (fr) * 1963-07-09 1964-05-22 Grob & Co Ag Tringle de contact pour casse-fils électriques
US3725911A (en) * 1971-12-15 1973-04-03 Batson Cook Co Stop motion device with selective indicator
US3907006A (en) * 1973-07-24 1975-09-23 Sulzer Ag Apparatus for indicating the breakage of warp threads in a loom

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE251904C (de) *
DE542397C (de) * 1929-08-16 1932-01-23 Crompton & Knowles Loom Works Elektrischer Kettenfadenwaechter
BE899349A (nl) * 1984-04-06 1984-10-08 Picanol Nv Kettingwachter, meer speciaal voor zelfkantdraden.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1419077A (en) * 1921-05-11 1922-06-06 Draper Corp Warp stop motion
US2834381A (en) * 1955-04-08 1958-05-13 Grangier Emile Louis Droppers for warp detectors
FR1361816A (fr) * 1963-07-09 1964-05-22 Grob & Co Ag Tringle de contact pour casse-fils électriques
US3725911A (en) * 1971-12-15 1973-04-03 Batson Cook Co Stop motion device with selective indicator
US3907006A (en) * 1973-07-24 1975-09-23 Sulzer Ag Apparatus for indicating the breakage of warp threads in a loom

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040154681A1 (en) * 2002-12-24 2004-08-12 Staubli Faverges Heddle, heddle frame and weaving loom equipped with such a frame
US6981527B2 (en) * 2002-12-24 2006-01-03 Staubli Faverges Heddle, heddle frame and weaving loom equipped with such a frame
CN102704158A (zh) * 2012-07-06 2012-10-03 常熟市天豪机械有限公司 一种纬纱断头电气自停装置

Also Published As

Publication number Publication date
DE4119550A1 (de) 1992-12-17
ITMI921394A0 (it) 1992-06-04
ITMI921394A1 (it) 1992-12-14
BE1005019A5 (fr) 1993-03-23
IT1260542B (it) 1996-04-09
FR2677671A1 (fr) 1992-12-18
FR2677671B1 (fr) 1995-04-28

Similar Documents

Publication Publication Date Title
US5309951A (en) Contact drop wire for an electric warp stop
JPH06228845A (ja) 織機の制御装置
DE3885138T2 (de) Verfahren zum Kontrollieren und Auswechseln eines Wickelkörpers.
US3777787A (en) Weft carrier tape guide
US4432399A (en) Filling-thread monitoring device for jet looms
EP1270780A2 (de) Vorrichtung zur Ermittlung von Fadenbrüchen von Dreherfäden bei Webmaschinene bzw. Webmaschine, insbesondere mit Webschäften und einer Vorrichtung zur Ermittlung von Fadenbrüchen
US4520850A (en) Apparatus in a shuttleless weaving machine for making a selvage
US4503891A (en) Loom
US6044870A (en) Weaving reed and gripper guide element for a loom
DE3688052T2 (de) Kontrollsystem fuer den trennstift in einem trommelgespeicherten schussfaden.
JPH0327157A (ja) 少くとも１つの糸ガイドを有する丸編機用の給糸装置
CA1137386A (en) Loom stop motion system and method
US2117352A (en) Shuttle
JPH01174649A (ja) 織機のたて糸切れ位置検出装置
CN112323229B (zh) 穿经梭夹，穿经机以及穿引经纱的方法
DE2919836A1 (de) Fadenbruchdetektor
US2407162A (en) Loom shuttle
EP0937799B1 (de) Webmaschine, insbesondere mit pneumatischem Schussfadeneintrag
EP0358296B1 (de) Kettfaden-Einziehdüse
US20020079013A1 (en) Drop pin for stop motion
US1091432A (en) Self-threading shuttle for looms for weaving.
US4106275A (en) Process and device for high speed threading of yarn into a false-twisting spindle
DE3832100C2 (de) Vorrichtung zum Feststellen eines Schußfadenbruchs in einer Mehrphasen-Webmaschine
PT942082E (pt) Dispositivo de estiramento e de deteccao do fio de trama, teares mecanicos com injector
US2659395A (en) Automatically threading loom shuttle

Legal Events

Date Code Title Description
AS Assignment

Owner name: GROB & CO. AKTIENGESELLSCHAFT, A CORP. OF SWITZERL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:STEINER, ERNST;REEL/FRAME:006197/0147

Effective date: 19920527

LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19980510

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362